Incidents of sexual assault at U.S. military academies spiked nearly 50 percent during the last school year despite years of focus on the issue and declarations of zero-tolerance, according to results of a survey conducted by the Pentagon.

The number of students reporting unwanted sexual contact totaled 747 during the 2017-18 academic year compared with 507 in 2015-16, according to anonymous surveys of cadets and midshipmen. Unwanted sexual contact ranges from groping to rape.

"We’re disheartened and disappointed that the things and the strategies that we’ve employed just really aren’t getting the results that we want," Nathan Galbreath, deputy director of the Pentagon's Sexual Assault Prevention and Response Office, told USA TODAY on Thursday.